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fs_mount_options
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fs_mount_options [2020/06/12 16:19] Ira Weiny [Details] |
fs_mount_options [2020/10/27 17:01] (current) Ira Weiny |
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| - | **NOTE: kernel 5.8 is yet to be released. This document is therefore preliminary until it's release and subject to change.** | ||
| - | |||
| ====== Prior to kernel 5.8 ====== | ====== Prior to kernel 5.8 ====== | ||
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| As of kernel 5.8 additional DAX enabling options are available on some file systems, specifically: | As of kernel 5.8 additional DAX enabling options are available on some file systems, specifically: | ||
| - | ===== ext4 and ext2 ===== | + | ===== ext2 ===== |
| When mounting the filesystem, use the "-o dax" option on the command line or add 'dax' to the options in /etc/fstab. This works to enable DAX on all files within the filesystem. It is equivalent to the '-o dax=always' behavior below. | When mounting the filesystem, use the "-o dax" option on the command line or add 'dax' to the options in /etc/fstab. This works to enable DAX on all files within the filesystem. It is equivalent to the '-o dax=always' behavior below. | ||
| - | ===== xfs ===== | + | ===== ext4 and xfs ===== |
| - | As of kernel 5.8 xfs supports the new per-file dax configuration. | + | As of kernel 5.8 ext4 and xfs supports the new per-file dax configuration. |
| ==== Summary ==== | ==== Summary ==== | ||
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| - | === Seeing if a file is using dax === | + | === Detecting if a file is using dax === |
| The current enabled state (S_DAX) is set when a file inode is instantiated in memory by the kernel. It is set based on the underlying media support, the value of FS_XFLAG_DAX and the file system's dax mount option. | The current enabled state (S_DAX) is set when a file inode is instantiated in memory by the kernel. It is set based on the underlying media support, the value of FS_XFLAG_DAX and the file system's dax mount option. | ||
fs_mount_options.1591978792.txt.gz ยท Last modified: 2020/06/12 16:19 by Ira Weiny
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